/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.facebook.presto.operator.aggregation.noisyaggregation;

import com.facebook.presto.common.block.BlockBuilder;
import com.facebook.presto.common.type.StandardTypes;
import com.facebook.presto.spi.function.AggregationFunction;
import com.facebook.presto.spi.function.AggregationState;
import com.facebook.presto.spi.function.CombineFunction;
import com.facebook.presto.spi.function.InputFunction;
import com.facebook.presto.spi.function.OutputFunction;
import com.facebook.presto.spi.function.SqlType;
import com.facebook.presto.type.SfmSketchType;

import static com.facebook.presto.operator.aggregation.noisyaggregation.SfmSketchAggregationUtils.addIndexAndZerosToSketch;
import static com.facebook.presto.operator.aggregation.noisyaggregation.SfmSketchAggregationUtils.mergeStates;
import static com.facebook.presto.operator.aggregation.noisyaggregation.SfmSketchAggregationUtils.writeSketch;

@AggregationFunction(value = "noisy_approx_set_sfm_from_index_and_zeros")
public final class NoisyApproximateSetSfmFromIndexAndZerosAggregation
{
    private NoisyApproximateSetSfmFromIndexAndZerosAggregation() {}

    @InputFunction
    public static void input(
            @AggregationState SfmSketchState state,
            @SqlType(StandardTypes.BIGINT) long index,
            @SqlType(StandardTypes.BIGINT) long nzeros,
            @SqlType(StandardTypes.DOUBLE) double epsilon,
            @SqlType(StandardTypes.BIGINT) long numberOfBuckets,
            @SqlType(StandardTypes.BIGINT) long precision)
    {
        addIndexAndZerosToSketch(state, index, nzeros, epsilon, numberOfBuckets, precision);
    }

    @CombineFunction
    public static void combineState(@AggregationState SfmSketchState state, @AggregationState SfmSketchState otherState)
    {
        mergeStates(state, otherState);
    }

    @OutputFunction(SfmSketchType.NAME)
    public static void evaluateFinal(@AggregationState SfmSketchState state, BlockBuilder out)
    {
        writeSketch(state, out);
    }
}
